Improvement in bit-stocks



in the art or science to which they most nearly my improvements to hold in a bit.l Fig. 2 is OLIVER ELLSWORTH, OF BOSTON, MASSACHUSETTS.

, IMPROVEMENT IN BIT-STOCKS.

Specification forming part of Letters Patent No. 58,234, dated September 25, 1866.

To all whom it may concern:

Be it known that I, OLIVERELLsWoRTII, of Boston, Suffolk county, State of Massachusetts, have invented certain new and useful Improvements in the Mode ot'Attaching Tools to Handles; and I do hereby declare the following description and accompanying drawings are suicient to enable any person skilled appertain to make and use my improvements without further invention or experiment.

The nature of my invention consists in the peculiar construction and arrangement of the devices described and claimed in the following specification.

Figure l of the accompanying drawings is an elevation of the end of a bit-stock with an end view without the bit.4 Fig. 3 are the clamping-jaws and spring. Figs. 4, 5, and 6 are elevations.

In these drawings, AA is the end ofthe bit-stock, and L the shank. The end A has aV square socket in it to receive the shank ofthe bit M, which is tted to it.

There is a groove made in each side of the end A, to which grooves the clamping-jaws C O are litted, so as to vibrate freely on the pins D D, and are pressed apart by the spiralspring I below the tool-socket. These jaws have projections E E to clamp the bit and hold it :firmly when'the nut G is screwed toward the end A, and acts against the inclined planes K K on the outer sides of the jaws, the nut Ghaving a femalescrew fitted to the screw P on the end A, and the outside ot' the nut G is ribbed and seored'or milled, so that it Inay be turned with facility by the thumb and tingers. When the nut Gis screwed back from the end thejaws are opened by the spring I, as shown in Fig. 4, so that the bit may be removed and another inserted.

WhatIclaim as myinvention and improvement is` The arrangement of the jaws C O, pivoted on the pinsD D, with spring L, stationary screw P, and traversing nut G, the whole constructed as described, for the purposes set forth.

OLIVER ELLSVVORTH.

Witnesses:

WILLIAM A. DAVIS, TIIoMAs F. DAvIs. 

